ITPEC FE Morning October 2022 Question 43
ITPEC FE Morning October 2022 — Question 43 of 80
Message Authentication Code (MAC) — confirm message integrity and authenticity.
MAC is a short piece of data attached to a message that lets the receiver verify:
- The message has not been altered (integrity)
- The message came from the claimed sender (authenticity)
MAC uses a shared secret key — both sender and receiver must know it.
Why not others:
- (a) Check encryption method — MAC does not verify encryption; it verifies integrity
- (b) Check the overview — not a meaningful security function
- (d) Secure confidentiality — confidentiality is achieved through encryption, not MAC
Key rule: MAC = integrity + authenticity. Encryption = confidentiality. Don't mix them up.
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